The safest plan is to treat this as a two-day drive, not a single-day push. If you can move your 12:00 PM departure earlier, spend about two hours at Space Center Houston in Clear Lake; it is generally open from roughly 10:00 AM to 5:00 PM, with admission commonly around $30–35 for adults. Allow about 35–45 minutes from 1420 Eldridge Parkway via I-10 E and NASA Bypass, and reserve tickets ahead if you want the tram tour. If noon is firm, skip it rather than rushing—the full Houston-to-Darien drive is approximately 16–18 hours before breaks.
Leave Houston via I-45 N toward Dallas, then connect with I-20 E and I-55 N; expect heavy traffic around Houston and Dallas, so build in extra time. A practical first day is about 7–9 hours of driving, with fuel, food, and short walking breaks every two to three hours. After reaching the Jackson area, stop for a substantial dinner at Walker’s Drive-In in Fondren or The Pig & Pint near downtown; budget about $20–40 per person and allow an hour. Check operating hours before leaving, since dinner service can vary by weekday.
After dinner, continue north on I-55 only if everyone is alert; otherwise take a hotel near Jackson, or continue toward Memphis if you still have energy. Choose a property close to the interstate with free parking and straightforward late check-in rather than driving into a city center. Resume early the next morning on I-55 N through Memphis and St. Louis, allowing another 8–10 hours including stops before arriving in Darien; keep the route flexible, because construction and traffic near St. Louis and the Chicago suburbs can add significant time.
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